Right back to reply like I promised
So Barcelona is such an amazing city, it has everything architecture, art, shopping, beach, drinking, fab restaurants, nightlife and a fantastic tourist bus.
Basically most of the sights are reached by 2 tourist bus routes. One red, one blue. Both do circular trips and you buy your tickets and can hop on and off as many times as you like. Think you can but day tickets or a number of days and you buy them from the tourist info at the top of La Ramblas which is just by the placa de catalunya (I think) not far form Hard Rock Cafe if I remember rightly. If you stick to the bus routes you cant go wrong sight seeing wise.
The architecture is amazing, you must go and see the Gaudi Cathedral and also Parc Guell. Theres also Gaudi's apartment which is superb, the roof alone is worth the entrance fee. Football stadium is excellent too, as is the Olympic village. I also went to the zoo (see my avatar, of Snowflake the only known albino gorilla in the world, but has now sadly died
).
I would recommend a great bar to go to which is on Nou De La Rambla, which is the same street as Gaudi hotel, the bar is called the London Bar. Dont be put off by the name its not a typical Brit pub but one of the oldest in Barcelona and its where Ernest Hemingway used to frequent to write poetry and drink I suppose
La Rambla is good entertainment of a night with markets and street entertainers but like any other city watch your purse in this area, same with the old town of a night too. Although its great to get lost in there and taste some of the typical Spanish bars, we came across an amazing flamenco bar which was just young locals having a drink but they were all flamenco dancing - was brilliant. La Rambla is also very expensive to eat and drink, but its good to experience at least one drink watching the world go by particularly at nigh but you will pay double compared to one street off la Rambla.
Hope you have a fab time